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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95af7aeba586e1e95bb45260e007c00f276ce957db442d18626bc39655e3a5b' 
  AND token = '62zuJ0ShEyMcpDp0Rg0wy3c2ofr3hYnbvImcgZSOlBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}